I have recently been using Spotify on a Droid Turbo 2 with the default lost screen enabled. With this lock screen swiping up allows user to see notifications or, if music is playing on most apps, control sonds with back, play/pause, and skip. This feature works with all built in music players as well as others such as Soundcloud and Chromecast.
Unfortunatly while listening to Spotify I must unlock the phone navigate to the app then pause or control music. This is so inefficient and such a waste of a very user friendly system. I hope we can figure this out!